Research On Seeding Quantity Control Device Based On PLC

Seeding operations is the most basic part of modern agricultural production, At present, homework basically adopts the way of planting is through land wheel and the side box mechanical drive.Adopting this way of sowing, when the machine operation speed changes, sowing quantity basic don’t change, caused by uneven to sow, and often accompanied by leakage phenomenon of sowing and replay.For the problems of traditional planting mode, access to a large number of literature, comprehensive research status at home and abroad,a sowing quantity control device with PLC is designed.The device is in the machine, the device is on the basis of the original equipment. drill gear was improved. The measurement device is a PLC, as the core, through the establishment of the mathematical model of tractor’s speed and stepper motor speed,it can be to achieve the purpose of the moving speed of the tractor to control the stepper motor speed to achieve, that the speed control the drill seeding rate. The device also used the touch-screen display, through the programming of software,they can be real-time displayed for planter seeding rate,the speed of tractor,the stepper motor’s speed and traveling distance.This device will be firstly operate in the experiment which simulated tractor travel, first of all, test based on the conventional seed for calibration.Then at different speed,conventional rice and hybrid rice are verified for a seeding quantity. Seeding’s effect will also be researched, here mainly research the uniformity of sowing.in the test time,set up the moderate speed, the seeds will be scattered in the belt, through methods of random passage, seed number statistics, and analysis their seeding effect.After the end of the simulation test, the improvement of control device will be installed on a sowing machine, field experiment was carried outThrough the analysis of a large number of experimental data, the control device to achieve the following research results:(1) The control device is stable for work, the system anti-interference ability is strong, the design of protection circuit can endure long time work, won’t cause component overheating because of long time work, damage phenomenon.(2) Design of the touch screen display and control interface, display intuitive, easy to operate, can manual control and regulate,the establishment of the mathematical model of tractor’s speed and stepper motor speed,it can be to achieve the purpose of The precision seeding of the conventional rice seeds. The target is successful to complete, the value and the error is not more than3%,Less than5%of the precision seeding of standards.And uniformity of no more than agricultural production standards (40variation coefficient values)(3) Test of the hybrid rice varieties is not very ideal,for validation and uniformity of analysis.Test results to a certain extent beyond the agricultural production of precision seeding uniformity and standards.But each time the authentication target of sowing quantity isapproximate.It show that control model is feasible, but different varieties of calibration results is different, resulting in bigger error, the suitability of the device needs to be improved.(4) Field test, through the result of the multiple seeding metering device, for validation and error analysis, sowing quantity and the target scalar, error is no more than2.93%experiment effect is more ideal.In general,this topic development of the control unit has solved the problems about traditional mechanical drive sowing, sowing quantity control precision seeding effect is better, achieving the purpose of the original design, realizes the intelligent control, can be applied to agricultural production.